Testing device for the ignition systems of internal-combustion motors.



H. C. MINNS.

TESTING DEB ICE FOR THE IGNITION SYSTEMS OF INTERNAL COMBUSTION MOTORS.

' APPLICATION FILED IAN.23I I9I9.

- 1 ,297,7 1 5. Patented Mar. 18, I919 1N VE N 7' UR. HOV/1M.

ATTY.

t m ED TA E's PATENT OFFICE.

HENRY C. 'MINNS, TORONTO, ONTARIO, CANADA.-

mnsrrixre DEVICE non. THE IGNITION sYsrEMs or INTERNAL-COMBUSTIONMorons.

I To all whom it may concern:

Be it known that I, HnNRr C. MINNs, a resident of the city of Toronto,in the county of York, Province of Ontario,v Canada, a-

subject of the King of Great Britain, have invented certain new anduseful Improve- 'mentsin Testing Devices for the Ignition Systems ofInternal-Combustion Motors, of

which the following is a specification.

Intuning up an internal combustion motor, it is Important to ascertainwhether i conditions are right in the circuits of the electric ignitionsystem and whether .the

' spark plugs themselves are in proper-condi- 15 It is my objecttherefore to devise means for exam1ning,fwhen the motor is turned over,whether. a suitable sparking current ping and whether anly given sparkplug is nctioning proper 2 I attain my object by providing aholder inwhich .a spark. plug may be removably held,.which holder is providedwith a stem adapted to fit into the opening for-the spark plug in thecombustion chamber of the cylinder, whereby the spark plug is held inpo-.

sition for inspectionand in electrical connection with the metal o f thecylinder.

The device is hereinafter more specifically described and illustrate:in-the accompanyin drawingsLirIwhichigure 1 is 'a front elevation,partly broken away, of the device in position in the head of acylinderof an internal combustion motor with the spark plug in position;and

Fig. 2 a side elevation of the same with the spark plug in position.

In the drawings like numerals of reference indicate corresponding partsin the i The main parts of the device are a holder for a spark plug anda stem adapted to fit the s ark plug opening in the combustioncham er inthe cylinder of an internal combustion motor. In the drawings the stem 1is shownas a plug adapted tov screw into bird of the spark plug may beinserted as y Preferably the lower side of theshown. opening is V-shapedas shown and means are provided opposite the -V-shaped side to pressSpecification of Letters Patent. 1 P ato -the spark plug againstthelower side of the opening. A three point contact is thusob-.

nte'd Mar. 18,1919. Application at January 23,1919. Serial No. 272,701.

tained which will permit of spark plugs of varying diameters beingheldin position.

' Preferably the frame 2 is double, that is it has spaced sides 4 sothat-the V-shaped V side of the opening presents pairs of relativelythin edges adapted to engage in the I I threads of the body of the sparkplug, which increases the security of the holder. Prefer-. ably thespark plug is pressed toward the V- shaped side of theopening by meansof'a lever 5-, which is pivoted at 6 between the sides 4 of the frame. Athreaded rod 7 is pivotally connectedat 8 between. the sides 4 andextends up through a hole formed in the lever 5. A nut 9 screwed on theup er end of the rod bears against the upper side of the lever 5. A coilspring 10 is fitted on the rod 7 and engages the under side'of the-lever5. It is evident from this construction that the lever may. be actuatedto clamp a spark plug by rotating the nut 9, and that when the nut isunscrewed the coil sprin 10 will disenga e the lever from the spar plug.

- en a spark plug is held in position in one of these holders and theengine turned over, it becomes quite easy to ascertain whether propercurrent is flowing to the spark plugand whether the spark plug itv selfis functioning properly, and if not, to

make any necessary tests to ascertain where the trouble lies.

Preferably with a four cylinder engine all spark plugs are removed andset up in holders. With motors having a larger number of cylinders, anyarrangement may be adopted to suit the convenience of the operator.

.spark plug and provided with a stem. at

right angles to the axis of a spark plug carried by the holder andadapted to fit the spark plug opening of the cylinder of an internalcombustion motor.

plug opening of the cylin-.

3. A holder adapted to receive and'hold a spark plug and provided with astem threaded to fit the spark plug opening of the cylinder of aninternal combustion motor.

4. A spark plug holder comprising a stem' adapted to fit the spark plugopening of the adapted to lit the spark plug opening of the cylinder ofan internal combustion motor;

a frame connected to the stem having an opening therein to receive aspark plug, said opening being .V-shaped at one side;

and a movable part adapted to secure aspark plug in said openmg, saidmovable part being located opposite to the V-shaped side.

6. A spark plug holder comprising a stem adapted to fit the spark plugopening of the cylinder of an internal combustion motoi;

Copies of this patent may be obtained for five cents each, by addressingthe wernngton, 11.6.

a double frame connected to the stem having an opening therein toreceive a spark plug; and a movable part pivoted between t e parts ofthe frame adapted to secure a spark plug in said opening. I

7. A spark plug holder comprising a stem adapted to fit the spark plugopening of the cylinder of an internal combustion motor a doubleframe'connected to the stem having.

an opening therein to receive a spark plug; a movable part pivotedbetween'th parts of the frame, screw means adapted to actuate themovable part to secure a spark plug in the opening; and a spring tendingto move the movable art to release the spark plug. Signed at oronto,Canada, this 15th dag;

of Jan., 1919. a

HENRY C. MINN S.

so v

Commissioner of Patents,

